The costs of care in the U.S. are very high, in part because canre is relatively uncoordinated. To begin to address this and other issues, health care reform was passed, including the notion of accountable care. Under acountable care arrangements, providers are at risk for the costs of the care they provide to groups of patients. Evaluation of costs has made it clear that a large proportion of these costs are in the post-acute setting, and also that many specific problems such as adverse events and unnecessary readmissions occur following transitions...